Drill or cutter



July'3, 1-928. r

Y J. A. SCHREINER DRILL 0R CUTTER Filed July 20, 1925 2 Sheets-Sheet lk/5/27z 8.542272212871 1%? W' 7- July 3, 1928.

J.. A. SCHREINER DRILL 0R CUTTER Filed July 20. 1925 2 Sheets-Sheet 2 Ik/rz jclzrezzzer F? -W%% Patented July 3, 1928. I

UNITED STATES PATENT OFFICE.

OHN A. SCHREINER, orcnicAeo, ILLINOIS, ASSIGNOR, BY MESNEASSIGNMENTS, "rPAUL w. x0011 & COMPANY, or CHICAGO, ILLINOIS, A coRPoaArIoNor ILLINOIS.

DRILL 0R CUTTER.

Application fiIedJuIyaO, 1925. Serial No. 44,861.

My invention relatesto cutters and more particularly to a cutter ordrill for making opening-s inplastered walls.

It is a purpose of my invention to provide a cutter of the abovementioned character comprising a body portion having handles or othergripping means projecting from one face thereof andhaving an annular cutter member projecting from: the other face thereof- Said cutter memberis provided with a toothed edge portion, the edge being preferably madesimilar to saw teeth so that the cutter will cut with a sawing action asthe device is oscillated abouta central axis.

It is another purpose of my invention to provide means for mounting aplurality of different size cutter blades for cutting different sizeopenings on said body portion and also to provide means engageable witha conduit or pipe whereby said conduit or pipe acts as a bearing aboutwhich said device is turned and to provide means where by said bodportion is adapted to fit on pipes of di erent sizes.

It is another purpose of the invention to provide central guiding meanson said device comprising a guiding member adapted to project beyond thecutter member so that the same can. be forced into the plasteringwhereby the same will act as a guide turning in the hole thus formed inthe plastering to guide the cutting movements of the cutter member.

It is another purpose of the invention to provide a ledge outwardly ofthe outermost position of the cutter member for catching the materialcut out of the opening to prevent the same from dropping downwardly onto the operator of the tool when a hole 10 is being cut in the ceiling.The device is particularly adapted for cutting the holes in ceilingsthat are provided for outlet boxes and similar electrical devices.

Other objects and advantages of the in vention will appear as thedescription of the accompanying drawings proceeds. How ever, I desire tohave it distinctly understood that I do not intend to limit myself tothe exact details shown or described, but that I intend to include aspart of my invention all such obvious changes and modifications of partsas would occur to a person skilled in this art and as would fall withinthe scope of the claim.

V which the boss 12 and the In the drawings: 1 v I I Fig. l'is a topplan view of my improved cutter member showing the largest size cutterin position thereon;

Fig.2 is'a section taken the line 22 thereof; j r

Fig- '3 is a similar view showing the smaller cutter member in position;and

Fig. 4 is a sectional view of the tool taken on theline 4*4 of Fig. 3anda fragmentary sectional view of a portion of a ceiling showing theteeth being forced into the same, the guide member being reversed so asto be in positionfor punching an opening in the plastering. 1 1

Referring in detail to the drawings, my improved cutter member comprisesa body portion 10 which is provided with a central opening 1.1 and withan annular flange or boss 12 surrounding said opening having an opening13 therein into which a set screw 14 is threaded. Said body portion isfurther provided with an annular cutter supporting member 15 having aplurality of spaced endwise extending lugs 16 thereon with which thebolts 17 are adapted to screw-threadedly engage. An annular ledge orflange 18 extends outwardly from the body portion beyond the supportingflange 15 and is provided with a dished or concave upper face 19 whichis adapted to catch the material that drops down as the cuttingoperation proceeds. A pair of handles 20 extend outwardly and away fromeach other from the opposite face of the member 10 to that fromsupporting member 15 extend.

In the arrangeinent shown in Figs. 1 and 2. an annular cutter member 21made of steel similar to that used on saws is mounted externally of thesupporting member 15 in engagement 1 with the outer face thereof. Saidmember 21 is provided with a plurality of saw teeth 22 that aresubstantially V- shaped so as to cut in substantially the same manner ineither direction. The screws or bolts 17 pass through openings 23 in themember 21 to secure the same in position on the member 15. In Figs. 1and 2 a tubular guide member or sleeve 24 is mounted in the opening 11and is provided with a flange 25 that engages with the outer end of theboss 12, the set screw 14 engaging with the member 24 to hold the samein position. The

substantially on member 24 is used in this position when a relativelysmall pipe or conduit is provided such as a plpe. If a A pipe isprovided, the member 24 is dispensed-with,the pipe fitting directly. inthe opening-11. In either case, the pipe or conduit acts as a shaftaround which the tool is adapted to be turned, the tool ordinarily beingoperatedwith an oscillating motion about the axis of the opening 11, itbeing obvious that in this way a circular opening will be cut as thecutter 21 and the support 15 are concentric with said axis. I

In the arrangement shown in Figs. 3 and 4, a smaller cutter 21 made insubstantially the same manner asthe cutter 21 and which has teeth 22 issecured to the inner face of the member 15 bythescrews or boltsl'i'passing through openings 23 therein. In these figures, the" arrangementis also shown for the guide-member or sleeve 24 when no pipe or conduitis provided to be used as a hearing' member or central shaft about whichthe tool is oscillated.- In this arrangement, the member24 is reversedwith the flange 25 resting against the outer face 26 of the my namemember 10 and the set screw 14 engaged therewith to hold said member 24rigidy in position. The tool is then placed in the position shown inFig. 4. The member 24 is driven or pushed into the plasteringv or otherceiling material indicated by the numeral 27 to punch an openingtherein, whereupon the toolis rotated, said member 24 again acting as anaxis about which the device turns, the tool being guided in itsmovements by engagement of the member 24 with the opening thus providedin the ceiling 27 Having thus described my invention, what I desire toclaim and secure by UnitcdiStates Letters Patent is:

In a device ofv the character described, abody portion havingguidingmeans centrally thereof, an annular cutter concentric with saidguiding means extendingfrom one face thereof and handles extending fromthe other 'face' thereof, said body portion having an annular concaveledge outwardly of said cutter.

In'witness whereof, I hereunto'subscribe this 3rd day of July, A. D.1925.

J OHN A; SCHR'EIN'EH.

